Attachment for rock-drills.



No. 796,327.) PATBNTBDAUG. 1M, 1905'. M. HARDsocG.

'ATTACHMENT PoR. ROCK DRILLS,

immun ms@ f t? i A f. MMEJUY UNITED.. STATES Param* cerros.l

Specification of Letters Patent. v

Patented Aug. 1, 1905.

Application filed June 3, 1904. Serial No. 210,964.

.To a/ZZ whom it mfr/.U concern:

Be it known that I, MARTINHARDSOCG, a citizen of the United States,residing at Ottumwa, in the county of Wapello and State of Iowa, haveinvented certain new and useful Improvements in Attachments for Rock-Drills, of which the following is a specification. A

The device of the present invention is intended for use, primarily, withpneumatic rockdrills, although it may be used inother connections; andthe object of the invention is to provide means for drawing away thedust from the cutting end of the drill, so that the cutting operationlmay be facilitated and the operator relieved from. the annoyance anddanger of working in the dusty atmosphere.

The device is so arranged and constructed that it may be'readily appliedto or removed from rock-drills or cutting instruments of any usual andwell-known type without the neces-A sity for changing or altering .theconstruction of the Instrument in any way.

The invention consists in the features ofv construction and combinationof parts hereinafter described and claimed.

In the drawings illustrating the invention, Figures l, 2, and 3 aresectional views of the device as applied to bits or rock-dressing toolsof different shapes; Fig. il, a sectional View of the device incompressed relation; Fig. 5, a View of the cutting-face of the tool ofFig. 1, and Fig. 6 a modified form.

The device consists, essentially, of a protective sheath or covering ofrubber or other suitable flexible material having a body portion A ofsuitable diameter and provided at its outer end with an open mouth a,having' a contacting edge or rim B, which rim or edge is adapted to abutagainst the rock around the point at which the drilling or Adressing isto be done. At the opposite end is an opening C, provided witha-reinforced rim or collar c, through which opening is inserted a bit ofsuitable formation, which bit is preferably provided with a iiange D forthe contact of the rim or collar of the protective sheath. The preferredtype of bit(shown in Fig. l) is provided with an enlarged cutting-headE, having a serrated cutting-face c, which face is provided with atransversely-extending groove or channel e', communicating with alongitudinally-extending hole or opening F, which passes entirelythrough the bit for the passage of the exhaust-air from the hammer'ktherethrough. At one side of the body portion of the protective sheathis formed a tubular collar G, adapted to have an exhaustpipe H insertedthereinto.

In Fig. Sis shown atool having an enlarged cutting-head more especiallyadapted for the dressing of stone, and the shape of the pro'- te'ctivesheath is correspondingly altered. since it is obvious that theparticular shape or proportion of the various parts will in all cases bedetermined by the character of the tool tof which the deviceis applied.

ln use the sheath or cover is inserted into place on a tool of thecharacter indicated and is held in place by the impingement of the neckor collar yaround theopening D. The elasticity or flexibility of thesheath or cover allows the contacting edge' to be tightly pressed aroundthe point of application of the bit, after which the bit is reciprocatedin the usual manner, and as the -bit advances into the stone theprotective sheath will be compressed into the shape shown in Fig. 4, sothat it does not impede in any waythe operation of the bit. It will beunderstood that as the bit reciprocates the protective sheath willexpand and contract accordingly, being more and more compressed as thebit advances farther into the rock. The exhaust-pipe, which is attachedto an exhaustfan or other suitable appliance', exhausts the air fromaround the cutting-face ofthe bit, so that dust or chipswhich aregenerated will be readily carried away and discharged at a suitablepoint, thereby relieving the operator from all danger and annoyance fromsuch particles. When used with a bit of the character shown in Fig. 1,the exhaustair from the pneumatic tool will be carried through the bitand discharged at the cutting end and then drawn off by the exhaust-fan,so that the air discharged around the cutting-face of the bit will serveto initially dislodge all chips or dust from the point of application ofthe bit, and when dislodged said particles will be carried away by theexhaust-pipe, so that the hole drilled by the bit will be kept free fromrefuse of all kinds and the cutting operation greatly simplified. y

Although the device is especially adapted and intended for use with abitof the character shown in Fig. l, it may be employed with bits of anywell-known and suitable kind, since it is not entirely dependent for itssuccessful operation upon the exhaust-air from a pneumatic tool.Although preferably formed of rubber, it may be formed of other suitableiexible material so arranged as to entirely inclose the cutting-tool.

As hitherto stated, the shape and proportion of the parts composing thesheath may be varied to suit the character of bit with which it isemployed, and the radius of its operation will be determined by the sizeof the mouth around the bit. As shown in Fig. 6, the mouth is Widelydistended, giving the sheath a large radius from which it will exhaustthe dust, whereas in Figs. l and 2 the mouth is more contracted.

What I regard as new, and desire to secure by Letters Patent, is

l. In combination with a bit, a protective sheath having walls offlexible material adapted to be expanded by the forward movement of thebit and having a mouth adapted to abut against the substance being actedon and provided with an opening having walls adapted to impinge againstthe shank of the bit, and

an exhaust-pipe for exhausting air from the interior of the sheath,substantially as described.

2. In combination with a bit, a protective sheath having walls ofiiexible material and having an enlargedbody portion terminating at oneend in a mouth having edges adapted to abut against the substance beingacted upon, said body terminating at its opposite end in an openingsurrounded by an elastic ange adapted to impinge against the shank ofthe bit for holding the sheath in fixed contact with the bit andallowing its body to be laterally expanded with the forward movement ofthe bit, and an exhaust-pipe for exhausting air from the interior of thesheath, substantially as described.

3. In combination with a bit, a protective sheath of rubber providedwith an enlarged body portion terminating at one end in a mouth havingedges adapted to abut against the substance being acted on andterminating at its opposite end in an opening provided with a thickenedrim or fiange adapted to impinge against the shank of the bit and holdthe sheath in xed contact with the bit and allowing the body of thesheath to be expanded with the forward movement of the bit, a tubularflange in the side of the body portion, and an exhaust-pipe fittedthereinto for exhausting air from the interior of the sheath,substantially as described.

4. In a rock-drill. the combination of a bit adapted to be used with apneumatic tool, said bit being provided with a longitudinally-cxtendingpassage opening through its acting face for discharging exhaust-air fromthe tool` a protective sheath consisting of an enlarged body portionhaving at its outer end a contracted mouth with edges adapted to contactthe surface being acted on and provided at its opposite end with acontracted opening with walls adapted to contact the bit and hold thesheath in fixed relation to the bit at its attaching end and allow thebody of the sheath to be expanded with the forward movement of the bit,and an exhaust-pipe for exhausting air from the interior of the sheath,substantially as described.

MARTIN HARDSOCG.

